Firmware upgrade fails.

Zyxel_JonasTan Posts: 94  Zyxel Employee
First Anniversary 10 Comments Friend Collector First Answer

If you encounter difficulties in completing a successful firmware upgrade, please verify whether your network environment can resolve "," as illustrated in the figure below:

Tool: Eg. Windows "Command prompt" (shortcut: windows+R > cmd > Enter)

If not, kindly modify your DNS settings to or incorporate a rule in your firewall or router permitting access to the specified domain name "".

: "" utilizes port 443 for transmission; additional details can be found at this link.